!
!NOTE: the section numbers refer to the Metadata Guidelines document.
!
! Section 4.1: Originator Attributes
! ----------------------------------
!
PI_NAME=De Maziere; Martine
PI_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB
PI_ADDRESS=Ringlaan, 3; B-1180 Brussels; Belgium
PI_EMAIL=martine@bira-iasb.oma.be
!
DO_NAME=Vigouroux; Corinne
DO_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB
DO_ADDRESS=Ringlaan 3; B-1180 Brussels; Belgium
DO_EMAIL=corinnev@bira-iasb.oma.be
!
DS_NAME=De Maziere; Martine
DS_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB
DS_ADDRESS=Ringlaan, 3; B-1180 Brussels; Belgium
DS_EMAIL=martine@bira-iasb.oma.be
!
! Section 4.2: Dataset Attributes
! -------------------------------
!
DATA_DESCRIPTION=FTIR vmr vertical profile data of CH4 at Reunion Island (St Denis), instrument Bruker125HR 
DATA_DISCIPLINE=ATMOSPHERIC.CHEMISTRY;REMOTE.SENSING;GROUNDBASED
DATA_GROUP=EXPERIMENTAL;PROFILE.STATIONARY
DATA_LOCATION=LA.REUNION
DATA_SOURCE=FTIR.CH4_BIRA.IASB002
!
DATA_VARIABLES=DATETIME; LATITUDE.INSTRUMENT;LONGITUDE.INSTRUMENT;ALTITUDE.INSTRUMENT;SURFACE.PRESSURE_INDEPENDENT;SURFACE.TEMPERATURE_INDEPENDENT;ALTITUDE;ALTITUDE.BOUNDARIES;PRESSURE_INDEPENDENT;TEMPERATURE_INDEPENDENT;CH4.MIXING.RATIO_ABSORPTION.SOLAR;CH4.MIXING.RATIO_ABSORPTION.SOLAR_APRIORI;CH4.MIXING.RATIO_ABSORPTION.SOLAR_AVK;INTEGRATION.TIME;CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM;CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC;CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR;CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR_APRIORI;CH4.COLUMN_ABSORPTION.SOLAR;CH4.COLUMN_ABSORPTION.SOLAR_APRIORI;CH4.COLUMN_ABSORPTION.SOLAR_AVK;CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM;CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC;ANGLE.SOLAR_ZENITH.ASTRONOMICAL;ANGLE.SOLAR_AZIMUTH;H2O.MIXING.RATIO_ABSORPTION.SOLAR;H2O.COLUMN_ABSORPTION.SOLAR
!
DATA_START_DATE=
DATA_STOP_DATE=
DATA_FILE_VERSION=001
DATA_MODIFICATIONS=None
DATA_QUALITY=This data is intended for validation purposes
DATA_CAVEATS=None
DATA_RULES_OF_USE=please contact M. De Maziere
DATA_ACKNOWLEDGEMENT=The data are provided by the Belgian Institute for Space Aeronomy, and have been acquired with national, ESA and EU funding (project NORS)
!
!
! Section 4.3: File Attributes
! ----------------------------
!
FILE_NAME=
FILE_GENERATION_DATE=4507.500000
FILE_ACCESS=HYMN;NDACC
FILE_PROJECT_ID=AOID9999
FILE_ASSOCIATION=NDACC;NORS
FILE_META_VERSION=04R004;IDLCR8HDF
!
! Section 5.1 & 5.2: Variable Attributes
! --------------------------------------
!
VAR_NAME=DATETIME
VAR_DESCRIPTION=datetime (UT), defined relative to reference datetime of Jan. 1, 2000 at 0:00:00 UT which is equal to 0.00
VAR_NOTES=
VAR_DATA_TYPE=DOUBLE
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=MJD2K
VAR_SI_CONVERSION=0;86400;s
VAR_VALID_MIN=-5500
VAR_VALID_MAX=4498
VAR_FILL_VALUE=-90000.000000000
!
!
VAR_NAME=LATITUDE.INSTRUMENT
VAR_DESCRIPTION=latitude north (decimal degrees) of the location of the instrument
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=1
VAR_DEPEND=CONSTANT
VAR_UNITS=deg
VAR_SI_CONVERSION=0;0.017453292519943;rad
VAR_VALID_MIN=-90
VAR_VALID_MAX=90
VAR_FILL_VALUE=-90000.00
!
!
VAR_NAME=LONGITUDE.INSTRUMENT
VAR_DESCRIPTION=longitude east (decimal degrees) of the location of the instrument
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=1
VAR_DEPEND=CONSTANT
VAR_UNITS=deg
VAR_SI_CONVERSION=0;0.017453292519943;rad
VAR_VALID_MIN=-180
VAR_VALID_MAX=180
VAR_FILL_VALUE=-90000.00
!
!
VAR_NAME=ALTITUDE.INSTRUMENT
VAR_DESCRIPTION=altitude of the location of the instrument
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=1
VAR_DEPEND=CONSTANT
VAR_UNITS=km
VAR_SI_CONVERSION=0;1000;m
VAR_VALID_MIN=-0.05
VAR_VALID_MAX=10
VAR_FILL_VALUE=-90000.000
!
!
VAR_NAME=SURFACE.PRESSURE_INDEPENDENT
VAR_DESCRIPTION=surface pressure measured at the observation site
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=hPa
VAR_SI_CONVERSION=0;100;m-1 kg s-2 
VAR_VALID_MIN=0
VAR_VALID_MAX=1100
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=SURFACE.TEMPERATURE_INDEPENDENT
VAR_DESCRIPTION=temperature at ground level, measured at the observation site
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=K
VAR_SI_CONVERSION=0;1;K
VAR_VALID_MIN=0
VAR_VALID_MAX=500
VAR_FILL_VALUE=-90000.000
!
!
VAR_NAME=ALTITUDE
VAR_DESCRIPTION=Grid of altitude levels upon which the retrieved target vmr profile as well as pressure and temperature profiles are reported
VAR_NOTES= these altitudes are the centers of the retrieval altitude layers (geometric mean between the 2 layer boundaries); the reported vmr, P and T are effective layer values. 
VAR_DATA_TYPE=REAL
VAR_SIZE=47
VAR_DEPEND=ALTITUDE
VAR_UNITS=km
VAR_SI_CONVERSION=0;1000;m
VAR_VALID_MIN=0
VAR_VALID_MAX=120
VAR_FILL_VALUE=-90000.000
!
!
VAR_NAME=ALTITUDE.BOUNDARIES
VAR_DESCRIPTION= 2D matrix providing the layer boundaries used for vertical profile retrieval
VAR_NOTES= The retrieved partial columns are given between the boundaries provided in this vector. The lowermost boundary is equal to ALTITUDE.INSTRUMENT.
VAR_DATA_TYPE=REAL
VAR_SIZE=47;2
VAR_DEPEND=ALTITUDE;INDEPENDENT
VAR_UNITS=km
VAR_SI_CONVERSION=0;1000;m
VAR_VALID_MIN=0
VAR_VALID_MAX=150
VAR_FILL_VALUE=-90000.000
!
!
VAR_NAME=PRESSURE_INDEPENDENT
VAR_DESCRIPTION= Total effective air pressures in layers for vertical profile retrieval
VAR_NOTES=Pressure/temperature profiles are taken from NCEP; the pressure values represent the effective pressure in each layer and are reported at the center altitude of each layer
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=hPa
VAR_SI_CONVERSION=0;100;m-1 kg s-2
VAR_VALID_MIN=0
VAR_VALID_MAX=1100
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=TEMPERATURE_INDEPENDENT
VAR_DESCRIPTION=effective air temperatures in layers for vertical profile retrieval
VAR_NOTES=Pressure/temperature profiles are taken from NCEP; the temperature values represent the effective temperatures in each layer and are reported at the center altitude of each layer 
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=K
VAR_SI_CONVERSION=0;1;K
VAR_VALID_MIN=0
VAR_VALID_MAX=500
VAR_FILL_VALUE=-90000.000
!
!
VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR
VAR_DESCRIPTION= retrieved vertical profile of CH4 from solar absorption measurements, in VMR units
VAR_NOTES= retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir); HITRAN2004 spectroscopy
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=ppmv
VAR_SI_CONVERSION=0;1E-6;1
VAR_VALID_MIN=-1
VAR_VALID_MAX=10
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_APRIORI
VAR_DESCRIPTION=a priori vertical profile of CH4 used in the retrieval (OEM-SFIT2), in VMR units
VAR_NOTES= the same a priorti vertical profile was taken for all days in the present datafile
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE; DATETIME
VAR_UNITS=ppmv
VAR_SI_CONVERSION=0;1E-6;1
VAR_VALID_MIN=0
VAR_VALID_MAX=10
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_AVK
VAR_DESCRIPTION= averaging kernel matrix (AVK) of the retrieved vertical profile of CH4, in VMR/VMR units
VAR_NOTES=dimension 1 are the AVK rows; dimension 2 are the AVK columns
VAR_DATA_TYPE=REAL
VAR_SIZE=47;47;7
VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME
VAR_UNITS=1
VAR_SI_CONVERSION=0;1;1
VAR_VALID_MIN=-2.
VAR_VALID_MAX=2.
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=INTEGRATION.TIME
VAR_DESCRIPTION= duration of the measurement of the interferogram (and thus spectrum) from which the profile has been retrieved
VAR_NOTES= the duration increases with the spectral resolution of the measurement
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=s
VAR_SI_CONVERSION=0;1;s
VAR_VALID_MIN=0
VAR_VALID_MAX=21600
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM
VAR_DESCRIPTION= total random error covariance matrix associated with the retrieved vertical profiles of CH4, in VMR units
VAR_NOTES=This error covariance matrix includes the contributions from the measurement error and the model parameters random errors, not the smoothing error.
VAR_DATA_TYPE=REAL
VAR_SIZE=47;47;7
VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME
VAR_UNITS=ppmv2
VAR_SI_CONVERSION=0;1E-12;1
VAR_VALID_MIN=-2
VAR_VALID_MAX=2
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC
VAR_DESCRIPTION= total systematic error covariance matrix associated with the retrieved vertical profiles of CH4, in VMR units
VAR_NOTES=The error covariance matrix includes the contributions from the spectroscopic errors
VAR_DATA_TYPE=REAL
VAR_SIZE=47;47;7
VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME
VAR_UNITS=ppmv2
VAR_SI_CONVERSION=0;1E-12;1
VAR_VALID_MIN=-2
VAR_VALID_MAX=2
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR
VAR_DESCRIPTION= retrieved CH4 (vertical) partial columns in the retrieval layers
VAR_NOTES= partial column evaluations use a priori pressure and temperature values from NCEP
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=Pmolec cm-2
VAR_SI_CONVERSION=0;1.660539E-5;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=10000
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR_APRIORI
VAR_DESCRIPTION= a priori CH4 (vertical) partial columns in the retrieval layers
VAR_NOTES= partial column evaluations use a priori pressure and temperature values from NCEP
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=Pmolec cm-2
VAR_SI_CONVERSION=0;1.660539E-5;molec m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=10000
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR
VAR_DESCRIPTION=retrieved total vertical column of CH4 above St Denis / Ile de La Reunion - corresponding to retrieved vmr profiles 
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=Emolec cm-2
VAR_SI_CONVERSION=0;1.660539E-2;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=200
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_APRIORI
VAR_DESCRIPTION=a priori total vertical column of CH4 above St Denis / Ile de La Reunion - corresponding to a priori vmr profiles 
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=Emolec cm-2
VAR_SI_CONVERSION=0;1.660539E-2;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=200
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_AVK
VAR_DESCRIPTION= total vertical column averaging kernel for CH4 derived from mixing ratio averaging kernel
VAR_NOTES= this averaging kernel multiplies the partial column vector in order to get smoothed total column
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=1
VAR_SI_CONVERSION=0;1;1
VAR_VALID_MIN=-2
VAR_VALID_MAX=3
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM
VAR_DESCRIPTION=total random uncertainty on the retrieved total vertical columns of CH4 above St Denis / Ile de La Reunion
VAR_NOTES=smoothing error is not included!
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=Emolec cm-2
VAR_SI_CONVERSION=0;1.660539E-2;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=200
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC
VAR_DESCRIPTION=total systematic uncertainty on the retrieved total vertical columns of CH4 above St Denis / Ile de La Reunion
VAR_NOTES=
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=Emolec cm-2
VAR_SI_CONVERSION=0;1.660539E-2;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=200
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=ANGLE.SOLAR_ZENITH.ASTRONOMICAL
VAR_DESCRIPTION=astronomical zenith angle of the sun 
VAR_NOTES=in solar absorption mode, the sun defines the line of sight
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=deg
VAR_SI_CONVERSION=0;0.017453292519943;rad
VAR_VALID_MIN=0
VAR_VALID_MAX=180
VAR_FILL_VALUE=-90000.00
!
!
VAR_NAME=ANGLE.SOLAR_AZIMUTH
VAR_DESCRIPTION=azimuth angle of the sun (O at South, pos. to East, neg. to West)
VAR_NOTES=in solar absorption mode, the sun defines the line of sight
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=deg
VAR_SI_CONVERSION=0;0.017453292519943;rad
VAR_VALID_MIN=-180
VAR_VALID_MAX=180
VAR_FILL_VALUE=-90000.00
!
!
VAR_NAME=H2O.MIXING.RATIO_ABSORPTION.SOLAR
VAR_DESCRIPTION= vertical profile of the interfering species H2O in the retrieval, in VMR units
VAR_NOTES= retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir);water vapour column is retrieved together with methane
VAR_DATA_TYPE=REAL
VAR_SIZE=47;7
VAR_DEPEND=ALTITUDE;DATETIME
VAR_UNITS=ppmv
VAR_SI_CONVERSION=0;1E-6;1
VAR_VALID_MIN=-1
VAR_VALID_MAX=26177
VAR_FILL_VALUE=-9.0000E+004
!
!
VAR_NAME=H2O.COLUMN_ABSORPTION.SOLAR
VAR_DESCRIPTION= total vertical column of the interfering species H2O in the retrieval
VAR_NOTES=retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir);water vapour column is retrieved together with methane
VAR_DATA_TYPE=REAL
VAR_SIZE=7
VAR_DEPEND=DATETIME
VAR_UNITS=Zmolec cm-2
VAR_SI_CONVERSION=0;1.660539E+1;mol m-2
VAR_VALID_MIN=0
VAR_VALID_MAX=200
VAR_FILL_VALUE=-9.0000E+004
!
!

